OpenAirDocs.org

19950130005039I

Incident · Minor damage
Open the Markdown

FAA incident report · Rkwell NA-265-60 · Orlando, FL · January 30, 1995

FAA Aviation Safety Information Portal

© OpenStreetMap
Date
January 30, 1995 · 09:15 local
Place
Orlando, FL
Airport
Orlando Executive Airport
Phase of flight
Ground Taxi, Other Airplane
Operating rules
General operating rules (Part 91)
Damage
Minor damage
Aircraft
N39CB
Reported as
Rkwell NA26560
Reported engine
Pratt & Whitney JT12A8
People aboard
5
Fatal injuries
0
Pilot’s flight hours
3,600 total2,200 in this make and model46 in the last 90 days
N39CBRegistered now · Rockwell International NA-265-60S/N 306-116 · Built 1976Airframe modelRockwell International NA-265-60Engine modelPratt & Whitney JT12A-8Turbo-jet

From the FAA’s Accident/Incident Data System (AIDS), through its Aviation Safety Information Portal, as reported. The NTSB investigates accidents separately, and its record of an accident is the fuller one. The aircraft is matched to the registry by N-number and event date, checked against the reported make and model; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

What happened

The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.

Narrative: on January 30, 1995 at 9:15 EST, NA-265-60, N39CB, owned by dxs services ran off the taxiway during taxi for takeoff. The crew reported they had just checked the steering main and standby both checked ok and when they started to make the left turn the aircraft failed to respond and they ran off the taxiway and into the mud. The crew and maintenance personnel checked the hydraulic system and found the #2 hydraulic pump hesitated during gear retraction. The aircraft was flown to avmats, a certified repair station at st. louis, MO. Personnel at avmats reported the following: the #2 hydraulic pump achieved maximum pressure more quickly than #1. Operational check of the warning system revealed an intermittent audible warning system. The hydraulic control and fuel shutoff circuit breakers were faulted, both had different valves of resistance each time they were reset and resistance would change markedly when the circuit breaker was lightly tapped . The loss of these breakers would disable both pumps and impair the warning circuit the pressure switches did not make and break at the same pressures each time. Characteristic of an intermittent switch. The high pressure switch powers the pump and the low pressure switch controls the warning. The #1 pump failed during operational checks. The #1 pumps overheat warning circuit was inoperative. The wiring was repaired in the overheat sensor circuit and normal operation was observed.

As the FAA filed it

NARRATIVE: ON JANUARY 30, 1995 AT 9:15 EST, NA-265-60, N39CB, OWNED BY DXS SERVICES RAN OFF THE TAXIWAY DURING TAXI FOR TAKEOFF. THE CREW REPORTED THEY HAD JUST CHECKED THE STEERING MAIN AND STANDBY BOTH CHECKED OK AND WHEN THEY STARTED TO MAKE THE LEFT TURN THE AIRCRAFT FAILED TO RESPOND AND THEY RAN OFF THE TAXIWAY AND INTO THE MUD. THE CREW AND MAINTENANCE PERSONNEL CHECKED THE HYDRAULIC SYSTEM AND FOUND THE #2 HYDRAULIC PUMP HESITATED DURING GEAR RETRACTION. THE AIRCRAFT WAS FLOWN TO AVMATS, A CERTIFIED REPAIR STATION AT ST. LOUIS, MO. PERSONNEL AT AVMATS REPORTED THE FOLLOWING: THE #2 HYDRAULIC PUMP ACHIEVED MAXIMUM PRESSURE MORE QUICKLY THAN #1. OPERATIONAL CHECK OF THE WARNING SYSTEM REVEALED AN INTERMITTENT AUDIBLE WARNING SYSTEM. THE HYDRAULIC CONTROL AND FUEL SHUTOFF CIRCUIT BREAKERS WERE FAULTED, BOTH HAD DIFFERENT VALVES OF RESISTANCE EACH TIME THEY WERE RESET AND RESISTANCE WOULD CHANGE MARKEDLY WHEN THE CIRCUIT BREAKER WAS LIGHTLY TAPPED . THE LOSS OF THESE BREAKERS WOULD DISABLE BOTH PUMPS AND IMPAIR THE WARNING CIRCUIT THE PRESSURE SWITCHES DID NOT MAKE AND BREAK AT THE SAME PRESSURES EACH TIME. CHARACTERISTIC OF AN INTERMITTENT SWITCH. THE HIGH PRESSURE SWITCH POWERS THE PUMP AND THE LOW PRESSURE SWITCH CONTROLS THE WARNING. THE #1 PUMP FAILED DURING OPERATIONAL CHECKS. THE #1 PUMPS OVERHEAT WARNING CIRCUIT WAS INOPERATIVE. THE WIRING WAS REPAIRED IN THE OVERHEAT SENSOR CIRCUIT AND NORMAL OPERATION WAS OBSERVED.